Bicycle frame



FIG. 1 is a front elevational view of a bicycle frame showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof; and

FIG. 6 is a left side elevational view thereof.

FIG. 7 is a top plan view of another embodiment of a bicycle frame showing our new design; and,

FIG. 8 is a bottom plan view thereof. The rest of views of the embodiment of FIG. 7 are the same as those of the embodiment of FIG. 1. 

The ornamental design for a bicycle frame, as shown and described. 